﻿/*!  
* 一个简单的Ajax类  
* author: tiger  
* date:   2010/07/08 星期四  
*  
*  
* @param sUrl          发送地址
* @param sRecvTyp      接受数据类型:0为xml 1为text
* @sQueryString        传递的参数，可以没有
* @param oResultFunc   返回结果处理函数
*/  

function Ajax(sUrl,sRecvTyp,sQueryString,oResultFunc) {
this.Url = sUrl;
this.QueryString = sQueryString;
this.XmlHttp = this.createXMLHttpRequest();
if (this.XmlHttp == null) {
alert("erro");
return;
}
var objxml = this.XmlHttp;
objxml.onreadystatechange = function (){Ajax.handleStateChange(objxml,sRecvTyp,oResultFunc)};
}

Ajax.prototype.createXMLHttpRequest = function() {
try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) {}
try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
try { return new XMLHttpRequest(); } catch(e) {}
return null;
}

Ajax.prototype.createQueryString = function () {
var queryString = this.QueryString;
return queryString;
}

Ajax.prototype.get = function () {
sUrl = this.Url;
var queryString = sUrl+"?timeStamp=" + new Date().getTime() + "&" + this.createQueryString();
this.XmlHttp.open("GET",queryString,true);
this.XmlHttp.send(null);
}

Ajax.prototype.post = function() {
sUrl = this.Url;
var sUrl = sUrl + "?timeStamp=" + new Date().getTime();
var queryString = this.createQueryString();
this.XmlHttp.open("POST",sUrl,true);
this.XmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
this.XmlHttp.send(queryString);
}

Ajax.handleStateChange = function (XmlHttp,sRecvTyp,oResultFunc) {
if (XmlHttp.readyState == 4) {
if (XmlHttp.status == 200) {
oResultFunc(sRecvTyp == 0?XmlHttp.responseXML:XmlHttp.responseText);
 
} else {
    alert("您所请求的页面有异常。");
}
}
}
 
